Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations and zero parameters, the description carries the full behavioral burden. The verb '返す' implies a side-effect-free read and it discloses the contents and the sequencing intent, but it never explicitly states that this is a read-only, no-side-effect call and does not describe the form of the returned content (single text blob vs. structured list).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, both earning their place: the first enumerates the payload, the second states the timing and follow-through. Content is front-loaded with the highest-value information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter, no-output-schema retrieval tool the description is nearly sufficient: it names the content and the when-to-call. The only residual gap is sibling disambiguation against b612_rules / b612_patterns / b612_review_checklist, which an agent might otherwise confuse.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes no parameters, so there is no parameter semantics to document; the baseline of 4 applies. The description correctly adds no misleading param details.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb (返す/returns) and an enumerated resource (NO SPECULATION, 実装前の3問自問, 5原則, 握りつぶし禁止), so an agent knows exactly what content arrives. It does not, however, distinguish this from near-siblings like b612_rules or b612_patterns, so the boundary is left to inference.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives explicit timing guidance: read this before starting a review or implementation and proceed along the principles. That is clear context for invocation. It stops short of naming when NOT to use it or pointing to an alternative sibling.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.